VARA_VIOAR
ID VARA_VIOAR Reviewed; 29 AA.
AC P58446;
DT 05-DEC-2001, integrated into UniProtKB/Swiss-Prot.
DT 05-DEC-2001, sequence version 1.
DT 25-MAY-2022, entry version 51.
DE RecName: Full=Varv peptide A;
OS Viola arvensis (European field pansy) (Field violet).
OC Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC rosids; fabids; Malpighiales; Violaceae; Viola.
OX NCBI_TaxID=97415;
RN [1]
RP PROTEIN SEQUENCE.
RX PubMed=9548831; DOI=10.1021/np970342r;
RA Claeson P., Goeransson U., Johansson S., Luijendijk T., Bohlin L.;
RT "Fractionation protocol for the isolation of polypeptides from plant
RT biomass.";
RL J. Nat. Prod. 61:77-81(1998).
RN [2]
RP PROTEIN SEQUENCE, FUNCTION, AND MASS SPECTROMETRY.
RX PubMed=14987049; DOI=10.1021/np030101l;
RA Svangard E., Goransson U., Hocaoglu Z., Gullbo J., Larsson R., Claeson P.,
RA Bohlin L.;
RT "Cytotoxic cyclotides from Viola tricolor.";
RL J. Nat. Prod. 67:144-147(2004).
RN [3]
RP FUNCTION.
RX PubMed=12477048;
RA Lindholm P., Goransson U., Johansson S., Claeson P., Gullbo J., Larsson R.,
RA Bohlin L., Backlund A.;
RT "Cyclotides: a novel type of cytotoxic agents.";
RL Mol. Cancer Ther. 1:365-369(2002).
CC -!- FUNCTION: Probably participates in a plant defense mechanism. Has
CC cytotoxic activity against a variety of drug-resistant and drug-
CC sensitive human tumor cell lines, and against primary chronic
CC lymphocytic leukemia cells. Has weak cytotoxic activity against primary
CC ovarian carcinoma cells or normal lymphocytes. {ECO:0000255|PROSITE-
CC ProRule:PRU00395, ECO:0000269|PubMed:12477048,
CC ECO:0000269|PubMed:14987049}.
CC -!- DOMAIN: The presence of a 'disulfide through disulfide knot'
CC structurally defines this protein as a knottin.
CC -!- PTM: This is a cyclic peptide.
CC -!- MASS SPECTROMETRY: Mass=2878; Method=Electrospray;
CC Evidence={ECO:0000269|PubMed:14987049};
CC -!- SIMILARITY: Belongs to the cyclotide family. Moebius subfamily.
CC {ECO:0000255|PROSITE-ProRule:PRU00395}.
CC -!- CAUTION: This peptide is cyclic. The start position was chosen by
CC similarity to OAK1 (kalata-B1) for which the DNA sequence is known.
CC {ECO:0000305}.
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DR AlphaFoldDB; P58446; -.
DR SMR; P58446; -.
DR GO; GO:0006952; P:defense response; IDA:UniProtKB.
DR InterPro; IPR005535; Cyclotide.
DR InterPro; IPR012324; Cyclotide_moebius_CS.
DR InterPro; IPR036146; Cyclotide_sf.
DR Pfam; PF03784; Cyclotide; 1.
DR PIRSF; PIRSF037891; Cycloviolacin; 1.
DR SUPFAM; SSF57038; SSF57038; 1.
DR PROSITE; PS51052; CYCLOTIDE; 1.
DR PROSITE; PS60009; CYCLOTIDE_MOEBIUS; 1.
PE 1: Evidence at protein level;
KW Direct protein sequencing; Disulfide bond; Knottin; Plant defense.
FT PEPTIDE 1..29
FT /note="Varv peptide A"
FT /id="PRO_0000043632"
FT DISULFID 5..19
FT DISULFID 9..21
FT DISULFID 14..26
FT CROSSLNK 1..29
FT /note="Cyclopeptide (Gly-Asn)"
SQ SEQUENCE 29 AA; 2902 MW; 3228B0EE3F82FA18 CRC64;
GLPVCGETCV GGTCNTPGCS CSWPVCTRN